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trien thi » trieu thi, tren thi, trien chi
tien thi » tiep thi, tien khi, tren thi
cac khoa » cac khoan, cac khoi, dac khoa
sach tri » sach tai, sach tren, sach truc
lao khoa » lo khoa, da khoa, ly khoa
te sach » toc sach
khoa he » hoa he, khoa hoc, khong he
co sach » bo sach, cuon sach, hoc sach
tri te » tri tue, tri le, tri ve
te lao » tue lao, te bao, te cao
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